Electric-arc lamp.



I D' A. ROSS. ELECTRIC ABO LAMP. 211101111011 111.1111 un. s. moa.

994,427, 1 Patented Jungs, 1911.

B BHEETB-BHEBT 1.

0.- A. ROSS.

ELECTRIC ARG LAMP.

ArrLloA'rIoN FILED H1B. 9, 1903.

994,427, Patented June 6, 1911.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

OSCAR A. ROSS, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, TOALBERT H. MEADS, OF CHICAGO, ILLINOIS.

ELECTRIC-ARG LAMP.

Specication of Letters Patent.

Application led February 9, 1903.

To all whom 'it may concern.'

Be it known that I, OSCAR A. Ross, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Im rovements in Electric-Arc Lamps, ofwhic the following is a full, clear, and exact description.

This invention relates to that class of electric devices commonly knownas arc lamps, and more especially to the division designated asinclosed, or long-burning arcs; that is, those in which the arc isinclosed in a practically air-tight chamber, which inclosure serves toretard oxidization of the electrodes. Such arcs burn from twelve totwenty times as long as the open type, between trimmings, and theireconomy is therefore obvious. Inclosed arcs have other advantages ofoperation which need not be speciied here, as they are well known andremain unchanged in the present case.

The principal object of my invention is to furnlsh new means forinclosing the electric arc in a comparatively air-tight chamber, whileat the same time permitting free and ready access to the electrodes, sothat the may be easily and quickly changed.

Vl'hile many arc lamps are used without the external lobe, it iscustomary to employ such a g obe, and much of the light'is lost in thismanner, while in every case the inner lobe requires frequent cleaningand is often roken in handling and by the intense heat of the arc.Furthermore, after even very limited use, the light from the arc isobscured by the soot thrown oil by the carbons, deposited on theinterior of the globe and quickly baked thereon by the heat, making thecleaning of the globe slow and diioult. The small size of the commonarcinclosing globe and the consequent close proximit of the arc to theglass, aggravate these di culties.

A special object of my invention is to simplify the lamp by using butone inclosing glass, substantially hemlspherical in shape and of suchsize that proper diiusion of the rays of the arc will be obtained, whileall parts of the glasslare so far removed from the arc that theobjections common to other types will be eliminated. l

The operating arts of the`lamp herein referred to are pre erably similarto those described and claimed in m application for patent filed May 29,1902, eral No.109,450, but my improved inclosin hereinafter describedmay e used in connection with almost any of the inclosed arc lampoperating mechanisms `at present on the market.

My invention is illustrated inthe accompanying drawing, in which:

Figure l represents an elevation of the lower part of the lamp in itsoperating position, with the inclosing chamber closed; Fig. 2 is asectional elevation showing the chamber open; Fig. 3 represents thecombined hinge and springs, and Fig. 4 the combined catch and springs.

A is a plate or cover forming the stationary top of the arc-inclosingchamber and provided with a downwardly extending Hnge having ahorizontal portion a at its e ge.

C is a suitable frame in the form of a flanged rin surrounding thestationary cover and adapted to carry the hinge and catches hereinafterreferred to.

B is the inclosing glass or globe forming the body portion of thechamber; it is in the shape of an inverted dome, its up er edge having aground flange 51 surroun ed by a metal ring b having a lange 52 uponwhich the edge of the globe rests. The rlng b3 is provided at one pointwith a loop 53 which embraces a U-shaped clip 54:, the arms of whichpass through openin s in the frame C and are each embraced y s rin btendin to draw the globe upward). il' the opposite point of the ring bis a li b adapted to be engaged b a s ring cato b consisting also of aU-s ape clip passing through holes in the frame C and having springs b*which tend to draw the globe upward when the catch is in engagementtherewith. When the glass is closed, it will be seen that the right-handside of the u per edge of its flan e 51, is held irmy against the undersi e of the flange a of cover A b the action of sprin s b, while theleft si e of the glass is sim' arly seated rmly on the correspondingside of the iange of cover A. It is thus evident that whenever thechamber is closed, provided the glass B has an even edge and is groundto its seat on cover A, the combined action of springs b* and b willhold the glass globe-chamber rmly against its seat on flanged forming anair-tight joint between the two parts and thus perfectly adapting thechamber to its purpose.

2l is the positive electrode, feeding through the hole 22, in a gascheck plate of ordinary construction.

23 'is the negative electrode, removably secured in its holder 24, whichis suspended from plate A.

The solenoid and other parts of the lamp operating mechanism are notshown, as they form no essential feature of my present invention.

While the glass B is preferably bowlshaped, as shown, for purposes ofbetter diffusion of the light of the arc, I do not limit my invention toany special shape of glass, or to any special number of hinges orsprings.

When it is desired to open chamber B for the purpose of changing theelectrodes, the catch b is pulled down and outward by its lower end (seeFig. 2) which serves asa loop handle, its upper end passing through andbeing held by springs 4 aga-mst stops 55. This allows the ring b3 andglass B to swing downward on hinge 53 to the position shown in Fig. 2,and access is thus had easily and quickly to the chamber. When the ringis forced upward until the glass B seats against flange a, it is evidentfrom the foregoing description that the catch b will, when snapped' outof engagement with stops 55 and into place under the lip be, lock theflange 51 against cover A and maintain chamber B in proper position forits intended purpose. It will be further seen that in raising the ringbs and glass B to the closed position, the flange 51 rst seats on theleft side of flange a, and then as the glass is gra'dually closed, thehinge 53 is orced downward against the resilience of spring b5, the leftside of ange a acting in such movement as a fulcrum for the glass; andthe tension thus produced in spring b5 is of course maintained when andafter the chamber is closed and catch b snapped. When the catch b isulled down and outward to release the ring the upper ends thereof engagethe stops 55 as heretofore described, and the catch is thus held in thisposition (see Fig. 2). When it is desired to close the inclosing chamberthe catch is pulled downwardly and inwardly so as to be released fromthe enga in device, and is then hooked over the lip e whereupon thesprings associated with the hinge and the catch ress the ringA tightlyagainst the cover The frame C is supported in any desired manner so asto support the globe B in proper relation to the carbone.

Having described my invention, I claim:

1. An arc lamp comprising an arc-inclosing casing having a stationarycover, a movable inclosing part adapted to engage said stationary coverand provided with a hinge, aI support for said hinge and an elasticconnection between said support and the hinge which permanently connectsthem together.

2. An arc lamp comprising an arc-inclosing casing, having a stationarycover, a movable inclosing part adapted to engage said stationary coverand provided with a hinge, a support for said hinge, an elasticconnection between said support and the hinge, a catch attached to saidsupport and adapted to engage and disengage said inclosing part, and anelastic connection between the catch and the support whereby theinclosing part is elastically forced into engagement with the stationarycover.

3. An arc lamp comprising a'stationary cover, a ring coperatingtherewith, a glass supported by said ring, a hinge connected with saidring, a support for said hinge, a spring interposed between the hingeand the support .so that it may be moved toward or from the support, anda catch fastened to said support removably engaging said ring.

4. An arc lamp comprising a stationary cover, a ring coperatingtherewith, a glass supported by said ring, a hinge connected with saidring, a support for said hinge, a spring interposed between the hingeand the support so that it may be moved toward or from the support, anda catch on said support adapted to engage said ring and elasticallyconnected with the support whereby the ring is forced against the coverwhen the parts are in their closed position said catch adapted to bedisengaged from said ring to permit the glass to move about said hinge.

5. An arc lamp comprising an arc-inclosing casing having a stationarycover, a ring associated therewith, a hinge attached to said ring,comprising a longitudinally movable part to which said ring isconnected, a support therefor, and a spring interposed between saidlongitudinally movable part and said support whereby the ring may bemoved to and from said support.

6. An arc lamp comprising an are inclosing casing having a stationarycover, a ring,` a glass supported by said ring, a hinge connected withsaid ring, comprismga U-sha ed clip upon which said ring is mounte asupport for said U-shaped clip, and a spring interposed between saidU-shaped clip and its support whereby it may be moved to vary theposition of the ring.

7. An arc lamp comprising an arc inclosing casing havin a stationarycover, a ring, a glass supporte by said ring, a hinge connected wlthsaid ring, comprising a U- shaped clip upon which said ring is mounted,a support for said U-shaped clip, a spring interposed between saidU-shaped clip and its support whereby it may be In witness whereof, Isubscribe my signamovlflidf to vary the Eoston of tle ring, ture, inpresence of two witnesses.

cate or en agn t e o poste si e of sa' y 1 1 ring providegd Witig'h a,pllojeotng part, and OSCAR A' Robb' a spring associated with saidprojecting Witnesses:

part and engaging said support whereby the H. C. CLARK,

catch may be moved longltudinally. W. H. CLARKE.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. Il.

